Dynamics of multipartite quantum correlations in the qubit-reservoir system

Abstract

We study the dynamics of multipartite quantum correlations in terms of genuinely
multipartite (GM) concurrence and global quantum discord in an N qubits system interacting
with independent reservoirs. For the initial mixed GHZ-like state, we
show that the multipartite quantum correlations initially in the qubits system can be
completely transferred to the reservoirs. During this process, the GM entanglement
exhibits sudden death for qubits and sudden birth for reservoirs, but the global quantum
discord presents the asymptotic behavior. In this sense, the global quantum discord is
more robust than GM entanglement in the evolution process. We put research emphasis on the
effects induced by the amplitude α of the initial state, purity p and the qubits
number N.
In addition, a sharp comparison between the dynamics of GM entanglement and that of global
quantum discord in both Markovian and non-Markovian regimes is made.